Re: [Discuss-gnuradio] Sampling Freq

[Jonathan Shan]

On Thu, 22 Mar 2007, Johnathan Corgan wrote:

> Jonathan Shan wrote:
>
> > When I send this to file_sink, I see correctly 16 samples from peak to
> > peak. However, when I transmit this using 'usrp sink' and receive at the
> > other end, I see about 32 samples from peak to peak.. double what I
> > expected. What is happening?
>
> What do you have the transmitter interpolation and receiver decimation
> set to?

interp_rate = 64, decim_rate = 16.

I saw the formulas
usb_sample_rate1 = 64e6 / decim_rate
usb_sample_rate2 = 128e6 / interp_rate

Using current values, usb_rate1 = 2 * usb_rate2. I'm assuming.. to
get the correct sampling freq, usb_sample_rate at both ends should be
same?

Jonathan Shan